EV5424-R-00A datasheet(21/44 Pages) MPS

21 / 44 page

MP5424

– 5V POWER MANAGEMENT IC WITH I2C AND MTP

MP5424 Rev. 1.0

MonolithicPower.com

12/6/2021

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

exceeds the reference voltage (VREF). Once VSS

exceeds VREF, then VREF takes over as the

reference. The four buck outputs’ tSS are

adjustable via the MTP. For the LDO2 through

LDO5 outputs, tSS is fixed internally at 50µs. For

the load switch, the soft-start slew rate is

consistent at 1.5mV/µs.

Output Discharge

In order to discharge the output capacitor (COUT)

during the shutdown sequence, there is a

passive

discharge

path

from

the

DC/DC

converter outputs, LDO outputs, and load switch

output to ground. The discharge path turns on

once the corresponding channel is disabled. The

typical discharge resistance is

Ω. The

discharge function can be enabled or disabled

through the I2C interface.

Over-Voltage Protection (OVP)

The MP5424 monitors the feedback voltage (VFB)

to detect possible over-voltage (OV) conditions.

If VFB exceeds 120% of the target voltage, then

both the high-side MOSFET (HS-FET) and low-

side MOSFET (LS-FET) turn off, and the

discharge path is turned on. The part exits this

regulation period once VFB drops below 110% of

VREF.

Over-Current Protection (OCP)

If the peak inductor current (IL_PEAK) reaches its

set limit and the HS-FET is on, then OCP is

triggered. The LS-FET turns on until the inductor

current (IL) drops to the valley current limit

(ILIMIT_VALLEY). Once IL reaches ILIMIT_VALLEY, then

the HS-FET turns on. The part does not exit OCP

unless IL_PEAK drops below its set limit. If the OCP

lasts longer than 150µs, then the buck enters

hiccup mode.

System Control Signals

PWRON Functions

PWRON is an input pin to that generates a start-

up or shutdown event. This pin can be

configured to detect a level or a falling edge via

the MTP.

If the PWRON_MODE bit is set to 1, then the

PWRON_DEBOUNCE_TIMER bit can set the

PWRON

pin’s

debounce

timer

filter

mechanical switch short-press noise.

If the PWRON_MODE bit is set to 0, then

PWRON operates as an enable (EN) pin. Pull

PWRON high to turn the PMIC on; pull PWRON

low to turn it off.

PWRON_MODE = 1 (Edge Trigger)

Start-Up

The start-up sequence begins once VAVIN

exceeds its UVLO threshold and PWRON is

pulled

low

for

longer

than

PWRON_DEBOUNCE_TIMER while the PMIC

is off. Once the start-up sequence is complete,

then the PWRON detection function can be

enabled.

OUT2

OUT4

RSTO

PWRON

Debounce timer

Stay in power on state

when PWRON keeps low

Figure 8: PWRON_MODE = 1 (Press PWRON to Start Up)

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